Add github actions based release automation

.github/workflows/release.yaml

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+# This is a GitHub workflow defining a set of jobs with a set of steps.
+# ref: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions
+#
+name: Release
+
+# Always tests wheel building, but only publish to PyPI on pushed tags.
+on:
+  pull_request:
+    paths-ignore:
+      - "**.md"
+      - ".github/workflows/*.yaml"
+      - "!.github/workflows/release.yaml"
+  push:
+    paths-ignore:
+      - "**.md"
+      - ".github/workflows/*.yaml"
+      - "!.github/workflows/release.yaml"
+    branches-ignore:
+      - "dependabot/**"
+      - "pre-commit-ci-update-config"
+    tags: ["**"]
+  workflow_dispatch:
+
+jobs:
+  build-release:
+    runs-on: ubuntu-24.04
+    permissions:
+      # id-token=write is required for pypa/gh-action-pypi-publish, and the PyPI
+      # project needs to be configured to trust this workflow.
+      #
+      # ref: https://github.com/jupyterhub/team-compass/issues/648
+      #
+      id-token: write
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: install build package
+        run: |
+          pip install --upgrade pip
+          pip install build
+          pip freeze
+
+      - name: build release
+        run: |
+          python -m build --sdist --wheel .
+          ls -l dist
+
+      - name: publish to pypi
+        uses: pypa/gh-action-pypi-publish@release/v1
+        if: startsWith(github.ref, 'refs/tags/')

pyproject.toml

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+# tbump is used to simplify and standardize the release process when updating
+# the version, making a git commit and tag, and pushing changes.
+#
+# ref: https://github.com/your-tools/tbump#readme
+#
+[tool.tbump]
+github_url = "https://github.com/jupyterhub/jupyter-rsession-proxy"
+
+[tool.tbump.version]
+current = "2.2.1"
+regex = '''
+    (?P<major>\d+)
+    \.
+    (?P<minor>\d+)
+    \.
+    (?P<patch>\d+)
+    (?P<pre>((a|b|rc)\d+)|)
+    \.?
+    (?P<dev>(?<=\.)dev\d*|)
+'''
+
+[tool.tbump.git]
+message_template = "Bump to v{new_version}"
+tag_template = "v{new_version}"
+
+[[tool.tbump.file]]
+src = "setup.py"